C1:
`(2/5 +1/2) xx1/4 = (4/10 + 5/10) xx 1/4 = 9/10 xx 1/4 = 9/40`
C2:
`(2/5 +1/2) xx 1/4= 2/5 xx 1/4 +1/2 xx 1/4 = 1/10 + 1/8 = 9/40`
C1:
A = (2/5 +1/2) x 1/4
= (4/10 + 5/10) x 1/4
= 9/10 x 1/4
= 9/40
C2:
A= 2/5 x 1/4 + 1/2 x 1/4
= 2/20 + 1/8
=4/40 + 5/40
=9/40
Giải :
Cách 1:
(2/5 + 1/2) .1/4
= 9/10 . 1/4
= 9/40
Cách 2:
(2/5+1/2).1/4
= 2/5 . 1/4 + 1/2 . 1/4
= 1/10 + 1/8
= 9/40
* Dấu chấm là dấu nhân nha *
I need a 40 coin, please give me more coin
